Add mention of YJIT in admin dashboard if enabled (#27283)

app/lib/admin/metrics/dimension/software_versions_dimension.rb

@@ -25,7 +25,8 @@ class Admin::Metrics::Dimension::SoftwareVersionsDimension < Admin::Metrics::Dim
   end
 
   def ruby_version
-    value = "#{RUBY_VERSION}p#{RUBY_PATCHLEVEL}"
+    yjit = defined?(RubyVM::YJIT) && RubyVM::YJIT.enabled?
+    value = "#{RUBY_VERSION}p#{RUBY_PATCHLEVEL}#{yjit ? ' +YJIT' : ''}"
 
     {
       key: 'ruby',